Journal of the Society of Powder Technology, Japan

Original Paper

Effects of Particle Volume Fraction and Surface Modifiers on Narrow Gap Filling by Liquid Epoxy Resins Containing Silica Particles

Yuki Matsuoka, Kazuya Fujisaki, Ken Oota, Tomonori Fukasawa, Hiroyuki ...

2013 Volume 50 Issue 8 Pages 552-560
Published: August 10, 2013
Released on J-STAGE: August 22, 2013

DOIhttps://doi.org/10.4164/sptj.50.552

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We have investigated the narrow gap filling by liquid epoxy resins containing silica particles at the volume fractions of 0.30, 0.40, and 0.49. The penetration of these liquid resin composites into a narrow gap between two parallel glass plates was observed. Addition of silane coupling agents reduced the filling time more significantly at the higher volume fraction of particles. This behavior was explained by the Washburn equation with the effects of the coupling agents on the surface tensions, contact angles, and shear viscosities of the liquid resin composites, which were experimentally measured. The narrow gap filling was theoretically described by a modified Washburn equation, where the non-Newtonian behavior of the liquid resin composites was considered by way of the shear-rate-dependent viscosity. The results from the modified Washburn equation semiquantitatively agreed with those from the experiments.

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Effects of Mechanical Processing Conditions on the Synthesis of Oxide Nano-particles

Kouhei Hosokawa, Akira Kondo, Masataro Okumiya, Hiroya Abe, Makio Nai ...

2013 Volume 50 Issue 8 Pages 561-566
Published: August 10, 2013
Released on J-STAGE: August 22, 2013

DOIhttps://doi.org/10.4164/sptj.50.561

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Mechanical synthesis of lanthanum manganite powder was investigated using attrition-type milling without any extra heat assistance. The starting materials were lanthanum oxide and manganese oxide powders. The BET equivalent diameters of them were 300 nm and 35 nm, respectively. In this paper, electric load conditions controlled by the rotor speed were changed to make clear their effect on the reaction. At 1 kW loading, lanthanum manganite was not synthesized even by 120 min processing. At 2 kW, the authors already reported that lanthanum manganite was successfully synthesized. However, the synthesized powders were agglomerated to form large granules. At 3 kW, synthesis was remarkably accelerated and well crystallized lanthanum manganite was synthesized. The BET equivalent diameter of the synthesized powder was larger than that processed at 2 kW. However, the synthesized powder didn't form large agglomerates. As a result, it was suggested that critical mechanical conditions exist to initiate the reaction.

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Review

Experimental Evaluations for the Interaction Forces between Soft Interfaces

Naoyuki Ishida

2013 Volume 50 Issue 8 Pages 567-575
Published: August 10, 2013
Released on J-STAGE: August 02, 2014

DOIhttps://doi.org/10.4164/sptj.50.567

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Since the interaction forces between solid surfaces in solutions are critical to understand the aggregation-dispersion behavior of colloidal particles in dispersion systems, direct measurements of the interaction forces between surfaces have been conducted in a large variety of systems over a past few decades. Recently, much effort has been paid to enable direct measurements of the interaction forces between "soft" interfaces, which show large deformation in solutions such as oil droplets, bubbles, lipid bilayers and cell surfaces, adopting atomic force microscopy techniques. This review illustrates how the interactions between surfaces including such soft interfaces can be measured and summarizes the current literature describing such experiments.

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